Why does iam.OpenIdConnectProvider use a custom resource?

[jabalsad]

Hello,

Looking at the source for iam.OpenIdConnectProvider, it appears to be using a custom resource to create these:
https://github.com/aws/aws-cdk/blob/v2.66.0/packages/@aws-cdk/aws-iam/lib/oidc-provider.ts#L104

However, CloudFormation supports an AWS::IAM::OIDCProvider. Any reason why the CDK does not use the native cfn type?
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-iam-oidcprovider.html